HMX FJ400 Film Series Linear Switches

The HMX FJ400 Film Series Linear is a mechanical keyboard switch engineered for enthusiasts who seek a harmonious blend of sound, feel, and performance. Designed with a focus on delivering a medium clack and a smooth keystroke, this switch is ideal for both work and play, offering a refined typing experience that stands out in custom keyboard builds.

Sound and Typing Experience

This linear switch is crafted to provide a balanced auditory profile. Its medium clack is distinct yet not overpowering, making it suitable for a variety of environments, from quiet offices to lively gaming setups. The combination of advanced materials in the housing and stem results in a deep, full sound when keys are bottomed out, contributing to a satisfying and consistent typing rhythm.

• Medium clack sound profile
• Deep, full bottom-out acoustics
• Suitable for both quiet and dynamic settings

Construction and Materials

The switch utilizes a T2 stem, a Polycarbonate (PC) top housing, and a P2 (Nylon) bottom housing. This material combination is chosen to enhance both durability and the overall sound signature. The 22mm single-stage spring ensures a uniform and reliable keystroke with every press.

• T2 stem for smooth actuation
• Polycarbonate top housing for clarity and resonance
• P2 (Nylon) bottom housing for a deep acoustic profile
• 22mm single-stage spring for consistent feedback

Performance and Feel

With an actuation force of 50g and a bottom-out force of 58g, the switch offers a comfortable medium weight that supports extended typing sessions without causing fatigue. The pre-travel distance of 2.0mm and total travel of 3.8mm provide a responsive and precise feel, making it suitable for fast typists and gamers alike.

• Actuation force: 50 ± 2g
• Bottom-out force: 58 ± 2g
• Pre-travel: 2.0mm
• Total travel: 3.8 ± 0.2mm

Smoothness and Lubrication

Each switch is factory-lubed with a blend of GPL105 and GPL205 lubricants. This ensures a silky-smooth actuation right out of the box, reducing friction and enhancing the overall typing experience. The pre-lubed design minimizes the need for additional modifications, allowing users to enjoy optimal performance immediately.

• Factory-lubed for smooth keystrokes
• Uses GPL105 and GPL205 lubricants
• Ready for use without further tuning

Mounting and Compatibility

The switch features a 5-pin PCB mount, offering stable and secure installation in a wide range of custom mechanical keyboard builds. This makes it an excellent choice for both new projects and upgrades to existing setups.

• 5-pin design for PCB mounting
• Compatible with most custom keyboard layouts
• Stable and secure fit

Key Specifications

• Type: Linear, factory-lubed
• Actuation Force: 50 ± 2g
• Bottom-out Force: 58 ± 2g
• Pre-travel: 2.0mm
• Total Travel: 3.8 ± 0.2mm
• Stem: T2
• Top Housing: Polycarbonate (PC)
• Bottom Housing: P2 (Nylon)
• Mounting Pins: 5-pin for PCB mount
• Spring: 22mm single-stage

Summary

Engineered for enthusiasts who value both sound and performance, this linear switch offers a medium clack, smooth actuation, and reliable build quality. Its thoughtful material selection, factory lubrication, and compatibility with custom builds make it a strong choice for anyone looking to enhance their mechanical keyboard experience.